Attachment for power-presses.



A. K. WITTLINGER. ATTACHMENT FOR POWER PRESSES.

'APPLIGATION FILED MAR.30,1912.

Patented. Dec, 22, 1914.

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um TED STATES PATENT orr on.

AUGUST K. WITTLINGER, OF NEW YORK, N. Y., ASSIGNOR T0 DOEHLER DIE CASTING COMPANY, A CORPORATION OF NEW YORK.

@TAGHMENT FOR POWER-PBESSES.

. Specification of Letters Patent.

Patented 35 cc. 22,

Application filed March 30, 1912. Serial No. 887,323.

To all whom it may concern:

Be it known that I, Aucus'r K. Wrrrnilvcnn, a subject of the Emperor of Germany, residing at the borough of Brooklyn, in the city of New Y0rk,.county of Kings, and State of New York, have invented certain new and useful Improvements in Attachments for Power-Presses, of which the following is a specification, reference being had therein to the accompanying drawings, which form a part thereof.

My invention relates to attachments for power presses, and more particularly to a type thereof adapted for use in forging metal.

An attachment of the character herein described is particularly adapted for use in connection with the production of brass forgin'gs of intricate parts to be utilized in lieu of the ordinary sand cast, machine finished parts. The production of such parts is accomplished by means of delicate dies acting upon brass heated approximately to the fusing point, the die acting upon an ingot of such metal to give it the desired form and density. Owing to the delicacy of the die which must be used, and the necessity for preserving this die in the interest of economy, it is necessary to provide an attachment for the press whereby the die will be caused to automatically accommodate itself to any slight variance in the bulk of the brass fed thereto in order to prevent the breaking of the die through the excessive resistance encountered thereby as a result of this excess material.

, With these conditions in mind, the main object of the invention is to provide anattachment for presses wherein the maximum pressure which may be developed by the die will be automatically governed and the die relieved from any excess pressure.

A further object is to provide in an att'achment of this character, means whereby the pressure regulating mechanism may be adjusted to set the press to y desired pressure.

A still further object is to provide an attac'hment embodying a ram which will comprise two sections united by a tog le joint, wherein means will be provided for normally setting said sections in a manner so that excess pressure will automatically break the joint against the tension of a spring resistance.

A still further object is to provide attachment of this character wherein if sired the two sections of the ram may beset in perfect alinement so as to prevent the breaking of the joint and permit the use so of'the press in the ordinary manner. And a still further object is to provide an attachment of this character which may he applied to the ordinary power press by merely substituting the attachment for the ordinary ram. 1

My invention consists in an attachment for power presses embodying therein a ram or punch having a head adapted to carry a die and adapted to be reciprocated by as means actuated from the shaft of a press, and a yielding member through which the power from said shaft is applied to the head of the ram whereby the maximum pressure exerted at the head of the ram will be limited by the resistance of said yielding member;

and in such other novel features of C0nstruction and combination of parts as are hereinafter set forth and described, and more particularly pointed out in the claims hereto appended.

Referring to the drawings :-Figure l a side elevation of the upper part of a press embodying my invention, the attachment being shown in vertical section; and Fig. 2 is a diagrammatic view showing the mode of operation of the attachment.

Like letters indicate like parts in both of said views.

In the embodiment'of the invention shown in the drawings, a indicates a press frame having mounted therein a power shaft 5 indicated in dotted lines carrying an eccen- -trio 0 for imparting to the ram the required reciprocatory movement.

The detailed construction of the press immaterial to this invention any desired a: well known design of press being capable use for this purpose.

Actuated from the eccentric a is a bi-pc w ram composed of two sections (5 and c, t first of which (Z, has adjustably mount therein an. eye pin 7' the lower end of whi is pivotally united to the section 6 by m of the pivot pin 9. The adjustment or pin f is secured by means of the bolt section (5 being hollow to receive the p i and "permit it to he adjust-ably mounted therein.

The sent-ion c is pivotally mounted a positive action of the ram while the-press is have an oscillatory movement about thepivots formed by the eccentric c and the pivot 11.

Carried by the head 7' is a casing is having a reciprocatory movement only, the press being provided with suitable side guides as Z for limiting it to this movement.

Fixedly mounted upon the casing k isa lurality of guide rods m upon which is aiidably mounted the plate n. Encircling each of the rods mis a coiled spring 0, act-- ing against the plate 71 and against a spring cup 79 carried by each of said rods m. The outer ends of the rods m are screw threaded and carried thereby and acting against the cups 312 are adjustment nuts (1 adapted to be set in any adjusted position by means of the lock nuts (7.

That side of the ram section 6 toward the springs 0 is provided with a projection c and acted upon by said projection and by the projection it upon the plate 7% is a link 7" which transmits the pressure of the springs 0 to the said section a and normally tends to restore the ram sections d e to their normal position. scribed constitutes the resistance through which power is applied to the head of the rain and which limits the power which may be applied to the ram head 1' through the ram (1 e. Upon the casing opposite to the projectlon c of the section 6 is a stop screw a which defines the'normal position of the. ram sections and at the same time permits'such adjustment thereof as to permit said sections to be brought into perfect alinement or to vary the angleof projection of one section relative to the other in order to insure the in operation.

cated at z and 5" respectively.

Th'eoperation of the herein described attachment when applied to a power press is substantially zisfollowsr-The two. parts of theqdie-t t being normally spaced apart, an

ingot of brass or other-similar metal heated to apoint just below the fusing point is fed to the die and the press is tripped. Withthe tripping of the press, the shaft 12 and with it the eccentr c c is rotated, forcing the ram (2 e downwardly carrying with it the casing 70, and the parts appurtenant thereto. The guides-Z limit the movement of thiscasing to a direct vertical movement. WVhen the shaft rotates, the power developed thereby will have a tendency to buckle the ram sections (Z c at their point-of pivotalconnection g,

this tendency being overcome'by the tension 'of the springs o acting through the link 1'.

The stop screw 8 not only defines the normal The spring rigging herein de-.

blow delivered by the ram.

- solely because of the r position of the sections a? e but also serves angle to each other as shown in Fig. 1, and

in the middle diagram of Fig. 2, and this condition will be maintained so long as the bulk of metal contained in an ingot is not in excess of that required to' forge with precision" the part to be made, orof which the part may be forged with a single blow. If, however, a single blow is not sufficient to forge the part, or if the bulk of metalin the ing'otis too great, the power of the eccentric 0 and the resistanceencountered by the die will act and react upon the sections 03 e in a manner to render the springs 0 inoperative to further advance the die and causethe sections d e to buckle slightly-and thus permit the continued rotation of said eccentric without applying any greater pressurethrough the die at any time than that developed by the springs 0 which will yield under the buckling action above referred to and thus avoid any injury to the die or to the ram itself. The slight rotative movement of the projection c is compensated for byjthe manner of mounting the link 7'. Im-

mediately after the'completion of the down tionj showndiagrammatically in the diagram to the left of Fig. 2.

' It will be observed that the sections d and je respectively *When they buckle, rotate The two parts of the split die are indiupon theeccentric c and about the pivot 71 to the ram head y'., The link 7' 'is free to have movement in a slot in the casing is.

. The tension of the springs 0 may beregulated. by means of the set nuts q, thus permitting. the regulation of the -force of the- WVhile the section 6 is pivoted to the' r 'a m head 7', theframe lcsis movable with the rant j 1.2 v

esistance. developed by the springs 0,..the pressure or force of the blow deliveredbeing-imparted through said springs and limited thereby.

The more obtuse the angle between the sections cl 6 the less will be'the tendency of said sections to buckle, so that ifitbe desired to slightly vary the pressure developed, such a variance may be accomplishedbymeans of the adjustment belt By meansof'the attachment herein dcscribed, the force of the blow imparted by the ram may be regulated to a nicety, and the ram itself may thus be caused to deliver a blow of constant force with a varied 5 length of stroke from an actuating member acting at a constant leverage.

If itbe desired to render the spring rigging inoperative, it ismerely necessary to withdraw the stop screw 3 sufiiciently to 113 permit the sections d and e to come into alinement as shown in the diagram to the left of Fig. 2, under which conditions power will be applied to the ram head through the "-aiii'sections directly, and not through the spring rigging.

it is not my intention to limit the invention to the precise details of construction shown in the accompanying drawings, it

being apparent that such may be varied 2 without departing from the spirit and scope of the in ention.

Having described my invention, what I claim as new and desire to have protected by Letters Patent, is

1. An attachment for power presses embodying therein a ram comprising two pivotally united sections, a head adapted to carry a die, a pivotal connection between said head and one of said sections, said last projection adjacent to its point of connection with the other section, means actuated by the power shaft of a press acting upon the ram section which does not carrysaid head, a casing movable with'said head, means limiting said casing to a reciprocanamed section being provided with a lateral tory movement, a spring rigging carried by said casing and movable with said head, a link operative against said projection and said spring rigging, and means whereby the 40 angle at the point of pivotal connection between said sections may be adjusted to determine the operative efiect of said spring rigging.

2. An attachment for power presses em- 415 bodying therein a ram comprising two sections pivotally united, a head adapted to carry a die, a pivotal connection between said head and one of said sections, said last named section being provided with a projection adjacent to its point of connection with the other section, means actuated by the power shaft of a press acting upon the ram section which does not carry said head to reciprocate both said sections, a casing movable with said head, means limiting said casing to a reciprocatory movement, a resistance spring carried by said casing, a movable plate against which said spring acts, a link between said plate and said projection, and 69 an adjustable stop oppositely disposed as to said link and acting to hold said sections in any desired position.

In witness whereof, I have hereunto affixed my signature, in the presence of two subscribing witnesses, this 18th day of March, 1912.

AUGUST K. WITTLINGER.

' Witnesses:

O. A. Sormononn, A. H. MOEELER. 

